Neophotonics blog: 800G Coherent versus PAM4 in data centers

400ZR pluggable coherent transceivers for up to 80-120km distance will emerge in 2020~2021 time frame, and their cost is expected to be comparable to today’s 80km 100G pluggable PAM4 transceivers, according to a new blog posting by NeoPhotonics' Dr. Winston Way.

The article discusses architectures for intra-data center 800Gb/s coherent- and 4 level pulse-amplitude (PAM4)-based pluggable optical transceivers.

https://www.neophotonics.com/800g-coherent-versus-pam4-optical-transceivers-data-centers/